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Non-oriented electrical steel for hub motor of portable electric bicycle and manufacturing method of non-oriented electrical steel

A technology of electric bicycles and oriented electrical steel, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of difficult processing and low efficiency of non-oriented steel, and achieve the reduction of processing fracture tendency, low loss, and improvement of transverse electromagnetic properties Effect

Active Publication Date: 2021-08-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high difficulty and low efficiency in processing non-oriented steel for existing small motors, the present invention provides a non-oriented electrical steel for light electric bicycle hub motors and a manufacturing method thereof

Method used

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  • Non-oriented electrical steel for hub motor of portable electric bicycle and manufacturing method of non-oriented electrical steel
  • Non-oriented electrical steel for hub motor of portable electric bicycle and manufacturing method of non-oriented electrical steel

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a non-oriented electrical steel for the hub motor of a portable electric bicycle, including the following components by weight percentage: Si: 2.38%; Als: 1.21%; Mn: 0.45%; P: 0.07%; C: ≤0.0, 3% S: ≤0.003%; N: ≤0.003%; Ti: ≤0.003%, the rest is iron and unavoidable impurities; the weight percentage of C, S, N and Ti satisfies the following formula: C%+S%+ N%+Ti%=0.0082%.

[0043] A method for manufacturing a non-oriented electrical steel for a hub motor of a portable electric bicycle as described above, comprising the following steps:

[0044] The molten steel made of each component is cast to form a slab: the molten iron is pretreated and enters the converter for smelting, and the molten steel after converter smelting is decarburized and alloyed through the RH furnace, and Si, Al, Mn, P, etc. Alloying elements are fine-tuned; molten steel whose composition meets the design requirements is continuously cast into a 230mm slab;

[0045] Slab h...

Embodiment 2

[0054] A non-oriented electrical steel for hub motors of portable electric bicycles, comprising the following components by weight percentage: Si: 2.43%; Als: 1.11%; Mn: 0.38%; P: 0.06%; C: ≤0.0028% S: ≤ 0.0028%; N: ≤0.0028%; Ti: ≤0.0028%, the rest is iron and unavoidable impurities; wherein the weight percentage of C, S, N and Ti satisfies the following formula: C%+S%+N%+Ti% = 0.0080%.

[0055] A method for manufacturing a non-oriented electrical steel for a hub motor of a portable electric bicycle as described above, comprising the following steps:

[0056] The molten steel made of each component is cast to form a slab: the molten iron is pretreated and enters the converter for smelting, and the molten steel after converter smelting is decarburized and alloyed through the RH furnace, and Si, Al, Mn, P, etc. Alloying elements are fine-tuned; molten steel whose composition meets the design requirements is continuously cast into a 230mm slab;

[0057] Slab heating and heat pr...

Embodiment 3

[0066] A non-oriented electrical steel for hub motors of portable electric bicycles, comprising the following components by weight percentage: Si: 2.34%; Als: 1.01%; Mn: 0.40%; P: 0.07%; C: ≤0.003% S: ≤ 0.003%; N: ≤0.003%; Ti: ≤0.003%, the rest is iron and unavoidable impurities; the weight percentage of C, S, N and Ti satisfies the following formula: C%+S%+N%+Ti% = 0.0074%.

[0067] A method for manufacturing a non-oriented electrical steel for a hub motor of a portable electric bicycle as described above, comprising the following steps:

[0068] The molten steel made of each component is cast to form a slab: the molten iron is pretreated and enters the converter for smelting, and the molten steel after converter smelting is decarburized and alloyed through the RH furnace, and Si, Al, Mn, P, etc. Alloying elements are fine-tuned; molten steel whose composition meets the design requirements is continuously cast into a 230mm slab;

[0069] Slab heating and heat preservation: ...

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Abstract

The invention discloses non-oriented electrical steel for a hub motor of a portable electric bicycle and a manufacturing method of the non-oriented electrical steel, and belongs to the field of non-oriented steel. In order to solve the problems of high processing difficulty and low efficiency of existing non-oriented steel for a small motor, the invention provides the non-oriented electrical steel for the hub motor of the portable electric bicycle. The non-oriented electrical steel for the hub motor of the portable electric bicycle is prepared from the following components in percentage by weight: 1.50-3.00% of Si, 0.50% to 2.00% of Als;, 0.20% to 1.00% of Mn, 0.01% to 0.20% of P, less than or equal to 0.005% of C, less than or equal to 0.03% of S, less than or equal to 0.03% of N, less than or equal to 0.005% of Ti, and the balance of iron and inevitable impurities, wherein the weight percentage of C, S, N and Ti meets the following formula: C% + S% + N% + Ti% is less than or equal to 0.01%. According to non-oriented electrical steel for the hub motor of the portable electric bicycle, the ductility of silicon steel is improved by reasonably controlling the element content, and machining is convenient. According to the manufacturing method of the non-oriented electrical steel, eddy current and magnetic hysteresis loss in a wound iron core is reduced, meanwhile, surface oxidation and surface nitride precipitation of a steel coil can be avoided, and the iron core loss is reduced; compared with existing non-oriented silicon steel with the same iron loss level, the elongation is higher, the subsequent cold machining performance is more excellent, and the machining is convenient while the excellent performance is ensured.

Description

technical field [0001] The invention belongs to the technical field of non-oriented steel production, and more specifically relates to a non-oriented electrical steel for a hub motor of a portable electric bicycle and a manufacturing method thereof. Background technique [0002] The popularity of green travel has made electric bicycles one of the important means of transportation for travel. Due to the use of various new technologies and materials, portable electric bicycles are smaller in size, lighter in weight, and more durable in structure than traditional electric bicycles. more and more popular with consumers. At present, the hub motor of electric bicycles generally adopts the outer rotor type permanent magnet brushless DC motor, and the stator iron loss of the motor is made of non-oriented electrical steel coils with a thickness of 0.35-0.6 mm. Due to the small diameter and fast speed of the portable electric bicycle hub motor, the motor core loss is relatively high;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14C21D1/26C21D1/28C21D1/74C21D6/00C21D8/12C21D9/52
CPCC22C38/02C22C38/04C22C38/06C22C38/004C22C38/14C21D1/26C21D1/74C21D6/005C21D6/008C21D8/1216C21D1/28C21D9/52C22C33/04
Inventor 刘青松裴英豪施立发夏雪兰何志坚程国庆
Owner MAANSHAN IRON & STEEL CO LTD
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